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CVE-2026-97373— draw.io: Incomplete SSRF blocklist in `ProxyServlet` / `Utils.sanitizeUrl`: RFC 6598 CGNAT range `100.64.0.0/10` is not blocked -> server-side request to internal CGNAT hosts

Quick assessment

Affected
jgraph drawio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

draw.io 是一款可配置的图表绘制与白板应用。在 30.3.8 版本之前，其可选的 端点存在服务器端请求伪造（SSRF）黑名单不完整的问题。当该端点启用时，URL 验证器未拒绝 RFC 6598 定义的共享地址段 100.64.0.0/10。未经身份验证的远程攻击者可利用此漏洞，诱导 draw.io 服务器向该地址段内可访问的内部服务发起请求，从而可能泄露运营商级 NAT（CGNAT）、Kubernetes、云环境或叠加网络中的敏感数据。该漏洞已在 30.3.8 版本中修复。

CVSS 5.8 · Medium
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I. Basic Information for CVE-2026-97373

Vulnerability Information
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Vulnerability Title
draw.io: Incomplete SSRF blocklist in `ProxyServlet` / `Utils.sanitizeUrl`: RFC 6598 CGNAT range `100.64.0.0/10` is not blocked -> server-side request to internal CGNAT hosts
Source: CVE Program / CVE List V5
Vulnerability Description
draw.io is a configurable diagramming and whiteboarding application. Prior to 30.3.8, the optional /proxy endpoint contains an incomplete server-side request forgery blocklist. When the endpoint is enabled, the URL validator does not reject the RFC 6598 shared address range 100.64.0.0/10. An unauthenticated remote attacker can cause the draw.io server to request internal services that are reachable in this range, potentially disclosing data from Carrier-Grade NAT, Kubernetes, cloud, or overlay-network addresses. This vulnerability is fixed in 30.3.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jgraph drawio < 30.3.8 -

II. Public POCs for CVE-2026-97373

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III. Intelligence Information for CVE-2026-97373

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Other References for CVE-2026-97373 (1)

IV. Related Vulnerabilities

Same product: drawio
Same vendor: jgraph
Same weakness: CWE-918